The Doepfer A-121-2 VCF in excellent condition.

Module A-121 is a voltage-controlled multi-mode filter with a cut-off slope of -12 dB / octave. It is the successor of the obsolete module A-121. The circuitry is different from the A-121 which used the obsolete CEM3320 filter circuit. The sound of the new module A-121-2 is identical to filter of the Dark Energy II/III.

These are the most important features of the module:

    voltage-controlled multi-mode filter with a cut-off slope of -12 dB / octave (idential to the filter of the Dark Energy II/III but has been expanded by the voltage controlled resonance feature)
    four simultaneous outputs are available, each with different characteristics: low-pass (LP), high-pass (HP), band-pass (BP) and notch (N)
    manual control Frq. for the cut-off frequency of the filter (the cut-off frequency determines the point at which the respective filter effect appears)
    two inputs for frequency control by means of external control voltages (frequency modulation, e.g. by ADSR or LFO):
    control voltage input FCV1 without attenuator, about 1V/octave sensitivity
    control voltage input FCV2 with attenuator FCV for the adjustment of the modulation depth of input FCV2
    frequency range about 10Hz ... 20kHz
    Manual control Q for the resonance of the filter
    control voltage input FCQ without attenuator for external voltage control of the resonance
    resonance up to self-oscillation, in which case the module will behave like a sine wave oscillator even without audio input signal
    audio input Audio In with attenuator Lev. for the adjustment of the filter input level (beyond about pos. 5 clipping/distortion occurs with typical A-100 audio levels)

Width: 8 TE / 8 HP / 40.3 mm

Depth: 50 mm

Current: +40mA (+12V) / -40mA (-12V)

Listed9 months ago
ConditionExcellent (Used)
Excellent items are almost entirely free from blemishes and other visual defects and have been played or used with the utmost care.learn more
  • A-121-2 VCF 12dB Multimode Filter
Made In
  • Germany

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Three Wave Music

MIDLAND PARK, NJ, United States
Joined Reverb:2014

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